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Discussion Starter · #1 ·
Going to be installing a new sub panel in the attached garage. This panel will be less than 30 feet down the wall. A friend who does electrical work insists that i need a seperate grounding rod and should hook it to the main ground in the primary panel. I know 4 conductors is required, but is it really necessary to have the rod?
 

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no. an attached garage is just like putting a sub in another part of the house. ground and neut are not bonded in the sub (which you appear to be aware of) and there is no other grounding other than the EGC you bring with the feeder.
 

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that you don't need a rod? I'm sure there is but I do not know the section off the top of my head.

If the garage was DEttached, then you would install a GE system (rods, water pipe (if present), Ufer, etc.) but in an attached garage, it is just another part of the house.

so, my question to you:

why would you need a rod for an attached garage but not for any other sub installed in a house?
 

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Discussion Starter · #5 · (Edited)
I appreciate the info. I just really need something concrete, and while everything I found supports this concept, Im looking for the scientific/authority on why it extra ground rods are incorrect.
 

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then look in chapter 250 of the NEC. It will state where a grounding electrode system is required and a sub-panel in the same building as the main panel is not included in where a GE system is required.

it is incorrect because the code says it is.

A ge system is only installed in a main service disconnect, a detached building, or where you have a separately derived service (such as where you install a transformer withing a building to reduce power from a 277/480 volt supply to a 120/208 volt system) as that would result with a main service disconnect.
 

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Going to be installing a new sub panel in the attached garage. This panel will be less than 30 feet down the wall. A friend who does electrical work insists that i need a seperate grounding rod and should hook it to the main ground in the primary panel. I know 4 conductors is required, but is it really necessary to have the rod?
From the way you state this, is your friend saying another ground rod is needed at the main panel? If so, not so. Unless maybe he's saying the existing ground at the main panel is incorrect or lacking?

If he's talking a ground at the subpanel in an attached garage, again not so.
 
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